Hi there , but sorry this question was not asked in JEE 2018 tl. This is a very good question so you can and try to solve for higher level examinations like JEE advanced . You should basically focus on NCERT based questions for JEE mains. Doing NCERT thoroughly is enough especially in chemistry, you can also focus in previous year questions for better results give mock tests and practice more and more questions . Hope this will help you.

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